Musnad Ahmad 907:160

Isma'il ibn Ibrahim narrated to us, from Ibn 'Awn, from al-Sha'bi, from Jabir ibn Samurah, who said: I was with my father, or with my son. He said: And he mentioned the Prophet, may Allah bless him and grant him peace, and he said: "This matter will continue to be mighty and fortified; they will be victorious over whoever opposes them regarding it, until twelve caliphs." Then he spoke a word that the people made unclear to me. So I said to my father, or to my son: "What is the word that the people made unclear to me?" He said: "All of them are from Quraysh."